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Finding the Fourth Proportional to 66.17, 91.13 and 53.91

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Solution

The fourth proportional to 66.17, 91.13 and 53.91 is: 74.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.17 : 91.13 = 53.91 : x
  2. Step 2: Convert to fraction form
    66.17/91.13 = 53.91/x
  3. Step 3: Cross multiply
    66.17x = 91.13 × 53.91
  4. Step 4: Simplify right side
    66.17x = 4,912.55
  5. Step 5: Solve for x
    x = 4,912.55/66.17
  6. Step 6: Final answer
    x = 74.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.